Add playground support for vertical mode.

[jaynewstrom-stripe]

Summary

API review is here: https://docs.google.com/document/d/1ZVVxyD5Ue6Xmh54JXf5r3rRCUBPxas01vl7if-FaO_M/edit

I will update the API again before making it public, if API review requires changes.

[github-actions]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │  0 B │   4.3 MiB │   4.3 MiB │  0 B 
     arsc │     1 MiB │     1 MiB │  0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │   8.1 KiB │   8.1 KiB │  0 B 
      res │ 301.5 KiB │ 301.5 KiB │  0 B │   455 KiB │   455 KiB │  0 B 
   native │   7.3 MiB │   7.3 MiB │  0 B │  18.4 MiB │  18.4 MiB │  0 B 
    asset │   1.5 MiB │   1.5 MiB │  0 B │   1.5 MiB │   1.5 MiB │  0 B 
    other │    87 KiB │    87 KiB │ +5 B │ 161.5 KiB │ 161.5 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  12.2 MiB │  12.2 MiB │ +5 B │  25.8 MiB │  25.8 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 21686 │ 21686 │ 0 (+0 -0) 
   types │  6869 │  6869 │ 0 (+0 -0) 
 classes │  5634 │  5634 │ 0 (+0 -0) 
 methods │ 31447 │ 31447 │ 0 (+0 -0) 
  fields │ 18315 │ 18315 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3404 │ 3404 │  0

APK

   compressed    │  uncompressed   │                                           
──────────┬──────┼──────────┬──────┤                                           
 size     │ diff │ size     │ diff │ path                                      
──────────┼──────┼──────────┼──────┼───────────────────────────────────────────
 29.1 KiB │ +5 B │   64 KiB │  0 B │ ∆ META-INF/CERT.SF                        
    271 B │ -1 B │    120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
  1.2 KiB │ +1 B │  1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA                       
──────────┼──────┼──────────┼──────┼───────────────────────────────────────────
 30.5 KiB │ +5 B │ 65.3 KiB │  0 B │ (total)

[github-actions]

Diffuse output:

OLD: identity-example-release-base.apk (signature: V1, V2)
NEW: identity-example-release-pr.apk (signature: V1, V2)

          │          compressed          │         uncompressed         
          ├───────────┬───────────┬──────┼───────────┬───────────┬──────
 APK      │ old       │ new       │ diff │ old       │ new       │ diff 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
      dex │     2 MiB │     2 MiB │  0 B │   4.3 MiB │   4.3 MiB │  0 B 
     arsc │     1 MiB │     1 MiB │  0 B │     1 MiB │     1 MiB │  0 B 
 manifest │   2.3 KiB │   2.3 KiB │  0 B │   8.1 KiB │   8.1 KiB │  0 B 
      res │ 301.5 KiB │ 301.5 KiB │  0 B │   455 KiB │   455 KiB │  0 B 
   native │   7.3 MiB │   7.3 MiB │  0 B │  18.4 MiB │  18.4 MiB │  0 B 
    asset │   1.5 MiB │   1.5 MiB │  0 B │   1.5 MiB │   1.5 MiB │  0 B 
    other │    87 KiB │    87 KiB │ -2 B │ 161.5 KiB │ 161.5 KiB │  0 B 
──────────┼───────────┼───────────┼──────┼───────────┼───────────┼──────
    total │  12.2 MiB │  12.2 MiB │ -2 B │  25.8 MiB │  25.8 MiB │  0 B 

 DEX     │ old   │ new   │ diff      
─────────┼───────┼───────┼───────────
   files │     1 │     1 │ 0         
 strings │ 21684 │ 21684 │ 0 (+0 -0) 
   types │  6869 │  6869 │ 0 (+0 -0) 
 classes │  5634 │  5634 │ 0 (+0 -0) 
 methods │ 31446 │ 31446 │ 0 (+0 -0) 
  fields │ 18315 │ 18315 │ 0 (+0 -0) 

 ARSC    │ old  │ new  │ diff 
─────────┼──────┼──────┼──────
 configs │  164 │  164 │  0   
 entries │ 3404 │ 3404 │  0

APK

   compressed    │   uncompressed   │                                           
──────────┬──────┼───────────┬──────┤                                           
 size     │ diff │ size      │ diff │ path                                      
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
    271 B │ -1 B │     120 B │  0 B │ ∆ META-INF/version-control-info.textproto 
 29.1 KiB │ -1 B │    64 KiB │  0 B │ ∆ META-INF/CERT.SF                        
  1.2 KiB │ -1 B │   1.2 KiB │  0 B │ ∆ META-INF/CERT.RSA                       
 25.9 KiB │ +1 B │  63.9 KiB │  0 B │ ∆ META-INF/MANIFEST.MF                    
──────────┼──────┼───────────┼──────┼───────────────────────────────────────────
 56.3 KiB │ -2 B │ 129.2 KiB │  0 B │ (total)

[tillh-stripe]

Should this be ExperimentalPaymentSheetLayoutApi?

[jaynewstrom-stripe]

Works for me. Let me update the API review too.